Lennox SLP99V
Signature Series Furnace
Modulating precision. Up to 99% AFUE. Whisper-quiet operation. The pinnacle of Lennox furnace engineering — installed right in Chicago.
IL License #2183457 · D's Air & Heating, Inc. · Chicago, IL
Model Specifications
Key Features
- Fully modulating gas valve — precise heat output in small increments
- Variable-speed ECM blower motor — ultra-quiet, efficient airflow
- Up to 99% AFUE — highest efficiency in the Lennox lineup
- Compatible with Lennox S40 Smart Thermostat for full communicating control
- Insulated cabinet for whisper-quiet operation
About the Lennox SLP99V
The Lennox SLP99V Signature Series furnace is the highest-efficiency and quietest gas furnace Lennox manufactures. Engineered with a fully modulating gas valve and variable-speed blower motor, the SLP99V adjusts heat output in precise increments to maintain exact indoor temperatures — eliminating the temperature swings common in older single-stage furnaces.
With up to 99% AFUE efficiency, the SLP99V converts nearly all fuel into usable heat, dramatically reducing gas consumption during Chicago's long heating season. The insulated cabinet and advanced airflow design make it one of the quietest furnaces available — homeowners often forget it's running.
When paired with the Lennox S40 Smart Thermostat, the SLP99V unlocks full communicating capabilities including self-diagnostics, adaptive airflow algorithms, and optimized staging. It's ideal for luxury installations, high-efficiency upgrades, and homes with comfort challenges such as cold basements, hot upstairs rooms, or drafty areas.
D's Air & Heating, Inc. has installed Lennox furnaces in Chicago since 2009. Every SLP99V installation includes permit pulling, proper load calculation, warranty registration, and a full startup inspection. No contracts required.
Recommended Add-Ons
S40 Smart Thermostat
Full communicating control and diagnostics.
PureAir™ S Filtration
Advanced air purification for the whole home.
Whole-Home Humidifier
Winter comfort upgrade — pairs perfectly with modulating heat.
Surge Protector
Protects the control board from power spikes.
What Chicago Homeowners Say
Silent Heat
The modulating heat is unreal. Our home stays the exact temperature we set. Gas bill dropped noticeably.
Marcus T. — Lincoln Square
Perfect Comfort
No more hot and cold spots. The SLP99V runs so quietly I forget it's on. Best investment we've made in this house.
Diane R. — Logan Square
Worth Every Penny
Darryl sized it perfectly for our two-flat. Permits pulled, warranty registered, everything done right.
Kevin M. — Humboldt Park
D's Air Service Call Policy
Ready for the Best Furnace Lennox Makes?
D's Air & Heating, Inc. · (773) 940-0965 · [email protected] · IL License #2183457